50 lines
1.4 KiB
Markdown
50 lines
1.4 KiB
Markdown
# Landtrain
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Landtrain extends Towbars to support chained towing.
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## Important
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Project Zomboid base `BaseVehicle.addPointConstraint()` force-breaks existing constraints and chain state in MP.
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To keep `1 -> 2` while attaching `2 -> 3` (and preserve movement replication), Landtrain includes a Java class override:
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- client install: `zombie/vehicles/BaseVehicle.class`
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- dedicated install: `java/zombie/vehicles/BaseVehicle.class`
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- helper class (both): `LandtrainConstraintAuthHelper.class` in the same `zombie/vehicles` folder
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This is the same override pattern used by mods like Realistic Car Physics (manual `zombie` folder copy).
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## Apply patch to game
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1. Patch your local client install:
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```powershell
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.\tools\patch-game-basevehicle.ps1
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```
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2. Patch the dedicated server install:
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```powershell
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.\tools\patch-game-basevehicle.ps1 -GameRoot "D:\SteamLibrary\steamapps\common\Project Zomboid Dedicated Server"
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```
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3. Ensure both mods are enabled:
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- `\hrsys_towbars`
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- `\hrsys_landtrain`
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## MP requirement
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For multiplayer, every connecting client and the dedicated server must run the patched class.
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If only one side is patched, towing links can desync with no explicit Lua error.
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## Restore vanilla class
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```powershell
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.\tools\restore-game-basevehicle.ps1
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```
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To restore dedicated server too:
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```powershell
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.\tools\restore-game-basevehicle.ps1 -GameRoot "D:\SteamLibrary\steamapps\common\Project Zomboid Dedicated Server"
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```
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